The Serene Innovations CentralAlert Mini Notification System includes the CentralAlert doorbell with the CA-CX Phone Signaler, so deaf and hard of hearing individuals can be notified when someone is at the door, and of incoming calls on home landline or cell phones, Skype?, FaceTime? and text messages. The Serene Innovations CA-CX is a cell phone and home phone sensor/transmitter that has a loud ringer and bright flasher to notify you know when there's an incoming call, Skype or FaceTime? calls and SMS messages. Connect the bed shaker to be notified even when you sleep. Includes a doorbell so you can be alerted when someone is at the door. Features: Plug in your landline phone or set your cell phone to vibrate mode and place it on the CA-CX phone sensor Compatible with home landline phones, cell phones, VP, Skype and FaceTime Compatible with cell phones with vibrate mode; activated after 3 seconds of vibration USB port for cell phone charging Unique green flashing patterns and adjustable ring tones distinguish between landline calls, cell phone calls and Skype Missed call or SMS message indicator light for the cell phone 2.5mm to 3.5mm cable included for phones that are not being detected: connect cable into audio jack of CA-CX 2.5mm to 3.5mm cable can also be plugged into audio jack of computer or tablet for audible alerts such as Facebook messages, video chats, etc. Detects and alerts to WEA (Wireless Emergency Alerts if provided with cell phone service) public emergency broadcast warnings Battery backup (4 AA batteries not included) Jack for bed shaker (sold separately) Includes: CA-CX Phone sensor with AC power adapter Short 2.5mm to 3.5mm cable Phone cord Doorbell sensor Warranty One year limited warranty Brand Serene Innovations Product Type Signaler Signaler Alert Type Audio, Light Signaler Style Wireless Lamp Plugin No Built-In Transmitter No Signaler Type Phone/VP/TTY, Door Vibrating Alert Yes, shaker not included